#region Using Directives and Copyright Notice

// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the Computer Consultancy Pty Ltd nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
// ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE 
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.

using System;
using System.Collections.Generic;
using System.Text;

using Interlace.Collections;

#endregion

namespace DatabaseCop
{
    [Serializable]
    public class ForeignKeyConstraint : Constraint
    {
        readonly TableConstraint _uniqueConstraint;
        readonly ForeignKeyRule _updateRule;
        readonly ForeignKeyRule _deleteRule;
        readonly bool? _isDisabled;
        
        internal ForeignKeyConstraint(ObjectName name, Table table, ConstraintType constraintType, IEnumerable<Column> keyColumns,
            TableConstraint uniqueConstraint, ForeignKeyRule updateRule, ForeignKeyRule deleteRule, bool? isDisabled)
        : base(name, table, constraintType, keyColumns)
        {
            _uniqueConstraint = uniqueConstraint;
            _updateRule = updateRule;
            _deleteRule = deleteRule;
            _isDisabled = isDisabled;
        }

        public TableConstraint UniqueConstraint
        { 	 
            get { return _uniqueConstraint; }
        }

        public ForeignKeyRule UpdateRule
        { 	 
            get { return _updateRule; }
        }

        public ForeignKeyRule DeleteRule
        { 	 
            get { return _deleteRule; }
        }

        public bool? IsDisabled
        { 	 
            get { return _isDisabled; }
        }

        public bool IsOneToOne
        {
            get
            {
                Set<Column> foreignKeyColumns = new Set<Column>(KeyColumns);

                foreach (TableConstraint tableConstraint in Table.TableConstraints)
                {
                    Set<Column> constraintColumns = new Set<Column>(tableConstraint.KeyColumns);

                    if (foreignKeyColumns.Equals(constraintColumns)) return true;
                }

                return false;
            }
        }
    }
}
